Create README.md for Android

Author: keerlu

android/README.md

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+# Android examples
+
+These examples demonstrate how to use TalkJS inside a native Android app:
+
+- [basic-example](./basic-example/): an example to get you started by showing you how to embed TalkJS into a WebView
+- [file-upload-example](./file-upload-example/): a demonstration of how to implement file upload support